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This was the world's "most successful" rogue trader

You know you’re walking in a minefield if you have a trading position that’s nearly five times the total economic output of Cambodia… or 1.5 times the market capitalisation of the big global bank you’re working for. And it’s even more risky if the bank you’re working for has no idea what you’re doing.
Jerome Kerviel was a junior level derivatives trader earning US$66,000 per year at Societe Generale (SocGen), one of Europe’s largest banks. We probably wouldn’t be talking about him now – except that as of January 9, 2008, he had amassed a stock index futures position of US$73 billion. The way he did so ended up costing Societe Generale ... (full story)

"And there was something else: Failed by supervisors more concerned with profits than traders’ mental health, Kerviel had become a trading addict. As we’ve written previously, the brain activity of successful traders is similar to that of someone high on alcohol, cocaine or heroin. A chemical called dopamine floods the brains of winning traders making them euphoric, just like drug users. But when profits turn to losses, the trader is like a junkie in need of a fix – he needs another successful trade to get a dopamine “high”."